Added Rubinius v2.2.3 to cover Travis CI compatability issues, fixes #74.
Added Rubinius v2.2.3 to cover Travis CI compatability issues, fixes #74.

sgerrand/bigcommerce-api-ruby,pedelman/bigcommerce-api-ruby,hasclass/bigcommerce-api-ruby,bigcommerce/bigcommerce-api-ruby,garrinmf/bigcommerce-api-ruby,mattolson/bigcommerce-api-ruby,gregory/bigcommerce-api-ruby,emeraldMaster/bigcommerce-api-ruby